Heat resistant material

ABSTRACT

A heat resistant material comprising an aluminum foil or an aluminum alloy foil, having finely powdered aluminum adhering to one or both sides of said foil.

United States Patent Nakayama et al.

[ Aug. 19, 1975 HEAT RESISTANT MATERIAL Inventors: Ryozo Nakayama;Sigeru ltakura,

both of-Yokohama, Japan Assignee: Tokai Metals Co., Ltd., japan Filed: 7May 5, 1972 Appl. No; 250,690

Foreign Application Priority Data May 17, 1971 Japan 46-32374 US. Cl.428/216; 428/447; 428/458; 428/328; 428/467 Int. Cl. B05c 9/04 Field ofSearch 117/68, 31, 26, 160 R; 106/15 FP References Cited UNITED STATESPATENTS 1/1934 Kilchling 117/68 X Primary Examiner-Ralph HusackAssistant Examiner-Theodore G. Davis Attorney, Agent, or FirnzOblon,Fisher, Spivak,

McClelland & Maier ABSTRACT A heat resistant material comprising analuminum foil or an aluminum alloy foil, having finely powdered aluminumadhering to one or both sides of said foil.

5 Claims, No Drawings HEAT RESISTANT MATERIAL BACKGROUND OF THEINVENTION 2 ester, etc., and/or, if necessary, a fire-proofing agent,and the mixture may be coated, or sprayed onto the surface of the foil.The thickness of the particle layer may range from 1p. up with no upperlimit except for 1. Field of the Invention structural considerations.

This invention relates to a heat resistant material, and It isparticularly superior to fix the fine powdered alumore particularly to aheat resistant material which utiminum onto the surfaces of both sidesof the foil to oblizes an aluminum foil or an aluminum alloy foil. tainoptimum heat resistance. Considerable heat resis- 2. Description of thePrior Art tance can be attained, even if only one side of the foil Sincealuminum foils and aluminum alloy foils have surface is treated with thealuminum powder. This emsuperior metallic brightness, they arecharacterized by bodiment would find utility for such applications as invery high heat insulating values. The melting point of printing surfacesor the like. aluminum is only 660C, however, so that when the foil Thethickness of the aluminum powder layer may be is contacted with a hightemperature flame, it will be approximately 2 microns or less, with goodresults. melted, thus losing its heat resistance and insulating Thedetails of the heat resistant mechanism of the properties. heatresistant material of this invention is not yet clearly understood.However, it is clear that the heat SUMMARY OF THE INVENTION resistanceeffect is not merely the additive effect of the Accordingly, it is oneobject of the present invention powdered aluminum, but is caused by someinter-relato provide a heat resistant aluminum containing matetionshipbetween the powder and the foil. rial which is capable of enduringtemperatures of above Having now generally described the invention, afurthe melting point of aluminum. ther understanding can be attained byreference to cer- This and other objects, as will hereinafter becometain specific Examples which are provided herein for more readilyapparent, have been attained by the dispurposes of illustration only andare not intended to be covery that if powdered aluminum is affixed tothe surlimiting in any manner unless otherwise so specified.

EXAMPLES 1 2 3 4 5 6 7 s 9 10 Thickness Temp. of Foil (mm) 0.008 0.0150.02 0.03 0.04 0.05 0.06 0.08 0.1 0.4

Treatment Both side X X X X X X non-treated Heat resisting X X X 0 O O OO 0 850C side treated Non-heat resisting side X X X X 0 O O O 0 treatedBoth side 0 O O O O O O O 0 treated Both side X X X X X X X X X IO()()C.non-treated Heat resisting X X X X 0 O 0 side treated Non-heat resistingside X X X X X 0 O 0 treated Both side 0 O O O O 0 treated face of analuminum foil or an aluminum alloy foil, that In this Table, treatmentrefers to coating a mixture the foil will surprisingly be capable ofresisting flame of 12 parts finely powdered aluminum with mineraltemperatures of up to 850C. without melting to an exspirits in a ratioof 65 to 35, 32 parts of silicone and vartent which would be detrimentalto use as a heat resisnish, and 4 parts of xyloyl onto a foil having athickness tant and insulating material. of 2 microns.

RR NOTE 1. The test foil was heated to 850C. using an al- DETAILEDDESCRIPTION OF PR cohol burner and at 1,000C. using a gas burner forEMBODIMENTS 10 minutes- According to one aspect of the presentinvention, a NOTE 2. X means that the foil was melted and a hole heatresistant material is provided which comprises an was created in thefoil; 0 means that the material aluminum foil or an aluminum alloy foil,having a fine remained resistant. powder of aluminum adherently attachedto one or As should be clear from the above Table, aluminum both sidesof the foil. foils and aluminum alloy foils treated with the fine pow-The aluminum foil or aluminum alloy foil used in this dered aluminumonto one or both sides demonstrates invention may be a foil having athickness of 8 to 100 significantly improved heat resistance as comparedmicrons. The powder may be of any shape, and preferawith untreated foil.bly having a particle size range of 5 200p The fine Having now fullydescribed the invention, it will be powder may be adherently bound tothe aluminum or apparent to one of ordinary skill in the art that manyaluminum alloy foil, by use of a binder, such as, for example, siliconeresin varnish, alkyd resin varnish, spar varnish, butyl titanite resinvarnish, etc. A solvent may be used, such as, for example, xyloyl,triol, fatty acid changes and modifications can be made thereto withoutdeparting from the spirit or scope of the invention as set forth herein.ACCORDINGLY,

\Vhat is claimed is:

4 resin varnish, alkyd resin varnish, spar varnish and butyl titanitcresin varnish.

4. The heat resistant material of claim 1 wherein said powdered aluminumhas a particle size range of 5-200 microns.

5. The heat resistant material of claim 3 which contains twelve partsfinely powdered aluminum. 32 parts of silicone and varnish and 4 partsof xyloyl.

1. A HEAT RESISTANT MATERIAL, WHICH CONSISTS OF AN ALUMINUM OR ALUMINUMALLOY FOIL OF A THICKNESS TO 0.02MM HAVIN FINELY POWDERED ALUMINUMADHERENTLY BOUND TO BOTH SIDE SURFACES THEREOF TO A THICKNESS OF NO MORETHAN 2 MICRONS.
 2. The heat resistant material of claim 1, wherein saidpowdered aluminum is admixed with a binder.
 3. The heat resistantmaterial of claim 2, wherein said binder is selected from the groupconsisting of silicone resin varnish, alkyd resin varnish, spar varnishand butyl titanite resin varnish.
 4. The heat resistant material ofclaim 1 wherein said powdered aluminum has a particle size range of5-200 microns.
 5. The heat resistant material of claim 3 which containstwelve parts finely powdered aluminum, 32 parts of silicone and varnishand 4 parts of xyloyl.